1 Lombardy Museum of Agricultural History, Milan, Italy; Department of Agricultural and Environmental Sciences, Production, Landscape, Agroenergy (Di.S.A.A.), Università degli Studi di Milano, Milan, Italy. Electronic address: luigi.mariani@unimi.it.
2 Department of Agricultural and Environmental Sciences, Production, Landscape, Agroenergy (Di.S.A.A.), Università degli Studi di Milano, Milan, Italy.
3 Department of Agricultural and Environmental Sciences, Università degli Studi di Bari "Aldo Moro", Bari, Italy; CGCEO, Michigan State University, East Lansing, MI 48823, USA.
4 Department of Agricultural and Environmental Sciences, Università degli Studi di Bari "Aldo Moro", Bari, Italy.